An asterisk * in the title indicates the field is mandatory.
If a field has a default value, it is shown in the Description column.
If the field type is an array, the Field Name has a .[n] suffix, where n is the array index placeholder.
Object and array field names are listed to provide context. If a field belongs to an object or an array, the full field name is shown in dot separated notation.

Title	Description	Details
AnnouncementId		Field Name: AnnouncementId Type: String
InMemory	Creates an object reference without actually committing the object as a permanent change. If you assign the output of this cmdlet called with this parameter to a variable, you can make changes to the properties of the object reference and then commit those changes by calling this cmdlet's matching Set-<cmdlet>.	Field Name: InMemory Type: Boolean
AnnouncementServerFqdn		Field Name: AnnouncementServerFqdn Type: String
NumberRangeEnd *	The last number in the range of unassigned numbers. Must be greater than or equal to the number supplied for NumberRangeStart. To specify a range of one number, use the same number for the NumberRangeStart and NumberRangeEnd. The number must match the regular expression (tel:)?(\+)?[1-9]\d{0,17}(;ext=[1-9]\d{0,9})?. This means the number may begin with the string tel: (if you don't specify that string it will be automatically added for you), a plus sign (+), and a digit 1 through 9. The phone number can be up to 17 digits and may be followed by an extension in the format ;ext= followed by the extension number.	Field Name: NumberRangeEnd Type: String
ExUmAutoAttendantPhoneNumber	The phone number of the Exchange Auto Attendant to route calls in this range to. This field is required only if you are not using an Announcement Service (in which case you do not supply values for the AnnouncementService or AnnouncementName parameters). The Exchange Auto Attendant contact must already be set up in order to assign a value to this parameter.	Field Name: ExUmAutoAttendantPhoneNumber Type: String
Priority	It is possible for unassigned number ranges to overlap. If a number falls within more than one range, the range with the highest priority will take effect.	Field Name: Priority Type: Integer
AnnouncementServiceId		Field Name: AnnouncementServiceId Type: String
NumberRangeStart *	The first number in the range of unassigned numbers. Must be less than or equal to the value supplied for NumberRangeEnd. The number must match the regular expression (tel:)?(\+)?[1-9]\d{0,17}(;ext=[1-9]\d{0,9})?. This means the number may begin with the string tel: (if you don't specify that string it will be automatically added for you), a plus sign (+), and a digit 1 through 9. The phone number can be up to 17 digits and may be followed by an extension in the format ;ext= followed by the extension number.	Field Name: NumberRangeStart Type: String
AnnouncementName *	The name of the Announcement that will be used to handle calls to this range of numbers.	Field Name: AnnouncementName Type: String Target: CsAnnouncement.Name
AnnouncementService	The fully qualified domain name (FQDN) or service ID of the Announcement service. This parameter is required only if you have not specified a value for the ExUmAutoAttendantPhoneNumber parameter.	Field Name: AnnouncementService Type: String Target: CsPool.Name
Identity *	A unique name for the range of unassigned numbers being created. All unassigned number ranges have a global scope, so the name specified here must be unique throughout the Skype for Business Server 2015 deployment.	Field Name: Identity Type: String

Model: device/skypeforbusinesshybrid/CsUnassignedNumber

Model Details: device/skypeforbusinesshybrid/CsUnassignedNumber